A dished piston will make even more power than a flattop if the quench is the same, better burn and more force on the piston's center. This would be a good test for a magazine to do, build three engines, all the same exact compression ratios, same piston to head clearance, but with different head chamber sizes and pistons to quanify the differences in burn rate and resulting power differences. The only variable would be the flow efficiancy of the heads- most open chamber designs flow bettern than small chamber designs. But a flow test could reveal those differences and adjustments could possibly be made to equalize the three. Bob